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Classification by Photoelectric Measurements of Molecular Bands: Current Status and Future Prospects

Published online by Cambridge University Press:  12 April 2016

Robert F. Wing
Robert F. Wing*
Affiliation:
Ohio State University

Abstract

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As a classification technique, photoelectric narrow-band photometry is especially effective in the case of late-type spectra, in which molecular bands furnish the most sensitive criteria. Measurements of molecular bands with bandpasses of about 50 Å can be made very efficiently, and for normal stars they can be calibrated in terms of temperature and luminosity. In the case of normal late-type giants and supergiants, two-dimensional classifications can be obtained from measurements of TiO and CN; for very cool giants and for dwarfs it is useful siso to measure VO and CaH, respectively. All these molecules have bands in the red and near-infrared spectral regions, where cool stars are relatively bright and where photometric accuracy is highest.

Type
VII Theoretically and Empirically Oriented Approach to Spectral Classification
Information
International Astronomical Union Colloquium , Volume 47: Spectral Classification of the Future , 1979 , pp. 347 - 373
Copyright
Copyright © Vatican Observatory 1979

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